http://musicbrainz.org/work/d2a1f57e-f7c9-4098-a716-f5c72815e0ab appears like it’s supposed to be our entry for the 1911 Firebird Suite. I say this because it’s based on the ballet and the 1919 suite is a later version, according to the relationships.
But, as can be confirmed by checking the score at IMSLP (conveniently linked from that page)… it has 5 parts, not 7. The first two works would appear to be the proper first part, split in two—so I suppose they could be merged. Parts 4 and 5 match up (though are named wrong/weird translations). “Supplications de Poiseau de feu” is just missing. #6 and #7 would appear to be from the 1919 suite (at least, from the names)
Looking at the linked recordings, it’s a mess—some of the recording titles imply they’re the ballet version, not the suite. Or say that they’re the 1919 version.
I’m going to re-enter the 1911 suite, clearly labeled as such, with an annotation noting there is more than one version. Note sure what to do with the existing mess, though.